“I do not have a crush on the Defense Against the Dark Arts teacher,” Costis insisted.

“Happy to hear it,” Professor Saccularius sang out. “As I understand it, those can be very awkward, for both parties. I’ll expect those scrolls on my desk first thing on Wednesday!” And he breezed past them as if he couldn’t tell that Costis was choking on his own tongue.

*

Or: the one where Costis is exceedingly suspicious of the new DADA professor.